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3587143
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Patent number 3,587,143
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Issue date Jun 28, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3556049
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Patent number 3,556,049
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Issue date Jan 19, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3465395
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Patent number 3,465,395
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Issue date Sep 9, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3309750
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Patent number 3,309,750
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Issue date Mar 21, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3035539
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Patent number 3,035,539
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Issue date May 22, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2630781
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Patent number 2,630,781
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Issue date Mar 10, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2614525
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Patent number 2,614,525
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Issue date Oct 21, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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1991013
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Patent number 1,991,013
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Issue date Feb 12, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1659349
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Patent number 1,659,349
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Issue date Feb 14, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE